SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22519985544e2359152dea1834addde1b7d866b747db5c7b8523fb5a243fd96c' 
  AND token = 'HYYCqigdysp2gcbWs1EelyRbo9Q69zFJ4ejt85W7oyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

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