SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48791f34591c6f59569f1f5322724fbdddbec5b83096f972f36e1a6c7436158f' 
  AND token = 'zubP+SABi+t1i3QTSE+TmUAZQyVLsz7NnhcSnZVvM/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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