SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f035c2a0696e8d5c3dec58ba08278907cad9df5c7d3c19b607e9bfa59b68a764' 
  AND token = 'IdPPjyj+8OmIqpGHZhHEvKBWWR+qfg9UkyP5eTWTD7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

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