SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f13da0ba8eee0993f5506769d5afe994d9039bcabefaef09ef786d25d8f1e22' 
  AND token = 'iC+emgwuma3C2BnOgJTFuuZzvAQxY2KaHyrHZrDNEtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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