SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f65d8f80da8705a466cb5840a3b45a6e602c4f887f23d9c32ef14e92e8cf09f' 
  AND token = 'zxkkQg9wvTjYsole9JxyEVGQqTHx9GXqP6fbgUXGjv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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