SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22016906362ab586572c6fabc7b6cfbcf328d23fcc5e6c7a8485ea7f2cf58c3d' 
  AND token = 'mpnp9IjEG5g+/uwdCfGZr7Wvl3NwQ+YP0VrMv3igQEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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