SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c851465800bc7e21232fd912d1fc2cf83be7f7702ccb37cc6aa0ea5a474079' 
  AND token = 'tJFeGj51bWtWpysPQy1kln+4l57y1JcaaQot08m99WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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