SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3fc8acd1f8b377b6f8e8dba91b2388c218c2305c4e21a03d23069a261be9f37' 
  AND token = 'w3IQS6ABFGZ750nWFwrbV/S/V+DzVbGFnyHE8SjqouA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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