SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9264264730fe983bbb2121d547cb1ff502a80495cb7647302f2594fa4d6b8d9e' 
  AND token = 'wqUW+T4n7XwjHhIAlTiNbBnkPZlRRxB6GT0puuJnlog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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