You can redirect the search results page to the product page if there is one match:

Create a new view to inherit and override the default by injecting the redirect at the start of the search results page:

This also sets the body of the page to nothing, so you don't see the results page render.  If you can live with the page refresh, this might be a solution for you.

Code:

<t t-call="website.layout" position="before">
  <t t-if="bins and len(bins[0]) == 1">
    <style type="text/css">body { display: none; } </style> 
    <meta http-equiv="refresh" t-attf-content="0;url=/shop/product/{{ bins[0][0]['product'].id }}" /> 
  </t>    
</t>