SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd352b1e7da130bb3eb79d269e849d3f873f473322f78eef0dc072da60c237cf1' 
  AND token = '/t/Wbb9VnZS4BuPlgOH7jMJX/0gh9hTxaWCVxiXimw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables