Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997f94d3ad4ccaf19709cc3f4f50cd361940c9c26cbd232441bdcd5abb4d6f13' 
  AND token = 'MVoC4MeOmmXZYgrUxRKrItgajYpYtWYjwQXvremzv6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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