SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ac955fbe564d3aee0c9b19ced13693a6330ff0d45fbac871804b7214ebbc89' 
  AND token = 'ipVvDVmKDVOTA2ea/nJgOeIGWMYaCMlX5KfmQBBIaUQ=' 
  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