SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98709750c7ba8d6ba19de79e5381e5ec426ff0c224f4bf2902ec0bb314e71e1' 
  AND token = 'KCzGUoCc8VyzUxK6CzNb8KxidelME/s67mcbyNa2yEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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