SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7247668b30b15921e59c593afe8a2ea01d7d7ee2356f8930bda1e014d5f18e82' 
  AND token = 'gOCgvFJjd+A6Z4NAigkIjbplOCnDGDlPg05Tww2inJk=' 
  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