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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c25ccab4f1483ca62e922a6820d919ba6e3811c46410604b75d69340e065cff' 
  AND token = 'rR7GkoFd0XtFJk20wyV4YOfw1rVJbnVR7KSsezy4J0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}