SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '597afb1e117da4d5d26c2e39976de3f8a4610f0d2a2fa94bbd1d96d94353d3aa' 
  AND token = 'Fr8is9QwKFiTVKjMmjovpUDX+Hu5bLqBBQ6q6iWrfxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

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