SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dff811b406ed847c48c971901af9369bcf9dde927f3b37d65451c2727498649' 
  AND token = 'IZzzUrk4bRQpsOYjgLpIxYTVmihIs8aS5YJ+JEuLqcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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