SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58df748fa25b6f9e16516520a297d65be282d386cef4594a2fdc545bfeb48f96' 
  AND token = 'I4jcGG+xebm/svqMFfxZ8XYhEJPbo9yuVawFhzval+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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