SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103e01e927c646bc584ff866398b98b35ed14b1230975317f6c847b1253f56f5' 
  AND token = 'ngdbyDtQB/IBiz1QK7xOMpyOR0aKaPYYAloHhVzn9ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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