Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3044916f7bcd6a60817aa4ff67f195034c40a15e1c7d867640a08e22391c6757' 
  AND token = 'nXQs38QV40wtOfAS0nxO35aUHtKapFRFjQg9FUHNR5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables