SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d7a283e474bfe6be531a35dd265671f450bcfa6cf69e8ebeb5f76c95d83015' 
  AND token = 'd+DXh1U5LR6ueknWZi8rvft8uepZZT/1CKP5JMQONns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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