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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7462605a53e3727b2cd9fa01f04d96fa458d78afc5c33a76f7bf7a9fd8873fa1' 
  AND token = 'gHThVw+xVV+Iet521ISuobx5QDd9bhY/7maXGpSYrn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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