Open a link in Safari with a keyboard shortcut
You can go through all links and controls in Safari using ⌥ Option+⇥ Tab. However, that's not ideal for Google. On Google, you can press ⇥ Tab and an arrow will appear next to the first result. You can then press the arrow keys to go up and down through the list.

When you have selected the link you want (either through ⌥ Option+⇥ Tab or Google’s way) you can press ↩︎ Return to open the link in the current tab or ⌘ Command+↩︎ Return to open it in a new tab.