SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5392defa1c9de743b0dba69bc5e18211ff3e322e7809469ddc8495ab9b17f45d' 
  AND token = 'b4oxc0T7X/YSuLnCngrXHlVz31E2pxNMA8VY7Lvd5pg=' 
  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