SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3ed1d49f5ca2770eb886741744279d892e1806d7a75b14026da9cd73191ba3' 
  AND token = 'WjYr20DwgJSVPv+r3iM0Ko8KnpI6Bl+MzbchNewVWEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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