SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb52edadcf3ecc5fda30a7930474371824cf9c9781ac581dec725be37a825ec9' 
  AND token = 'Ezg310J3roUMIWX0+fZLHxq6vMLXaEfj4Am/txQ0Awg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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