SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f203f83c6dd275719e0a284d397aaeb70cae5ee62e544949fc520c6642422324' 
  AND token = 'FK/ZdJUzcbY0L8POVwaXyOMCAsZnW88vG3VIWl2OPw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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