Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d9286f678dba1322b139258c4251d6a08933320db5c995989419093a371146' 
  AND token = 'PAFolDDbrXfmsioPKO+uoBcBhOFWh3FNTQoeFPOk/4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}