SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81adeeb9c9dfe33df3300f4f893ba6045af4547b1a5b565ed23621f3a2dd4e30' 
  AND token = 'E9yaPf7A8OlCUZgpmNWZtnz/XLBjtoXXixvulzdZ+ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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