SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f355528517a8189ed00ccc0fd407a3a70b8626da008deb5013265c0c55ad93' 
  AND token = 'MXPH7ClqUXrP7kdIoQiEKnctkd4gLfhM9iKW6DjU3Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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