SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b17f2fbd3d8d3df2343ad6f43af9d1345e8cf9b76f7f1d73d1044e764896ba' 
  AND token = 'vgOOGsZkIJbHwYPaAjzxvO2DZnRntlXUHhBApOj7+9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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