SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64d25374d7201525b69bfdadee28d8dab7edc1f0dd7d025e358d231bbc7b51e2' 
  AND token = 'sbzM30Ja8CWtAbzcwONXgEggnC7E7qO/sJBdXDW4mDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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