SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7799e9223544d675d0d4733ceea3d226a3f98a21def0cf55d72ae6147f7ca6e7' 
  AND token = '2XMlQrBXsgem+6r8YFilCAsVKECFgHr8bfO3Cc6giGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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