SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '243c1ab29e729ebdd9afde33cc41bd231436a8dd3817f546cb2bf9f6a2759795' 
  AND token = 'Rbbq5bgSco5rAKaaGjSu3X1/FkVGY0s8jf/JQbIQ7Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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