SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb9ea986003d02cd9d17f841b7134d2bd4672039ebf3644d89778eb01f0beac' 
  AND token = 'hN05pgV5pWKmJSfpkODyMG7/+0BvstKPdCmjdWRdmOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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