SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ccd1a61202190c250eba250832e8c7d8b3a4e3f7c1a11e38f45df298448b6f7' 
  AND token = 'LgWl8JK59Klx/cbEG4CrqMZw3ThcTQzVcqodkYjEGUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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