SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea56f5469dd9a7facaa43f1c8f6fb5658447d8cd46f4cd790db7fb09ec61141d' 
  AND token = '42T3pF4moGQihrxpBFGHTQajBBw2/pp7kYSmIbTzRA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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