SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b894ae01922ac802981611d4fcde9b5a89d4ab1968e513c65b4c21efbc2bfdb0' 
  AND token = 'ifPtmMliAJ/5bF+aBXZ1p1m4BnFnXu/jimlzIZcTRHI=' 
  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