SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36f45c0f029c2831fd6dfa0e5f46c2af4e1aceaf99ec6a939a75bd55f073af9' 
  AND token = 'YVA6q/f4KloIUH1KpCyD7GCuvegqj/Q4fbf095LcKn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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