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Luton's game on the south cost was halted midway through the second half with the score at 1-1 after defender Lockyer collapsed on the pitch.
The Wales international was removed from the field of play on a stretcher surrounded by a medical team to a standing ovation from the crowd. The Premier League confirmed the match had been abandoned.
"Our medical staff have confirmed that the Hatters captain suffered a cardiac arrest on the pitch, but was responsive by the time he was taken off on the stretcher," Luton said in a statement.
"He received further treatment inside the stadium, for which we once again thank the medical teams from both sides. Tom was transferred to hospital, where we can reassure supporters that he is stable and currently undergoing further tests."
The 29-year-old had already heart surgery in June after collapsing during Luton's Championship play-off final win against Coventry.
