SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25565b94903f161c05fdaa120c2b6094a34ec9ab6995b1f4680cf21e75ecb680' 
  AND token = 'Q1hYXPeg7gvDu6pNYSdxlHLg+GHTQ+qrlsLDSwKlsnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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