SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d25c07d5cc4b233c83a4a821f26de8706e67b6a886ba3b7c92daeada7ea9506' 
  AND token = '1SnR3hIyi5rDbfReY+tNTu6pJi7fG9hUtTN7JkSvlco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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