SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a84a9fa39ea28f4a82ae2917cb66275491d070d60144b52fa0e6951f62124d1' 
  AND token = 'NHfZakz0+bdMxJ96XQjs+497rQJjLZYaXpsNgqk0dTc=' 
  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