SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf4ec1d36f70d4d51caf44ad7cee875a3524564e47435d9935fb61e9d572aec' 
  AND token = '6BWr4ABBCStgd/+xqEwI5MzI8rBj7tSjyKf248pxt4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

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