SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ccbbca8aff12f9074c4a2fc9d297464e59a28638d76fbdb57cace608534788c' 
  AND token = '+ibR7bCQ06QTQiUAJ+PnjjVvz1Y8gt0Zukw5cNSI1CM=' 
  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