SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37883ec361fd8332463f1bcfb337abfe104486d3f365d23b0cd3392d349ca148' 
  AND token = '9W63pB/xrl0Vbz1eL0TmxwMAM+tzQ4ZyDnWcLhg2gW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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