SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd84994cb7cd886a8aed49c8858bc6de600ef9a4532b9f862f9646a44bcca2d' 
  AND token = 'H356jojUxBtIoufEq45sGUCn/+d0nVGr0RfqoSVVC1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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