SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d3e6f678961bacb931167447f944a47271ff22725e78d7f19e6ae831a2b0025' 
  AND token = 'smyh1IMY8YHCLY+t23nbvC9gQjpyIDd4gkvzvQPOk/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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