SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24eb4bdd8eca194eba51bac6f6fc5ab696b9f911a330bbc97e41d28ee6e71ebc' 
  AND token = 'C+SzAPHzy9ers+lxcA6pYLLHjJ1oJTwR+bpPvn7FZ9g=' 
  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