SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b039e1e3af8e610f8d545f2edf4c285b237a4575f3c1cdc90f48f4581d39357b' 
  AND token = 'g18iyAIaiL+0uw+QKTzJHZ2xn5ppnqJuExgLxl5vKzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

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