SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8eb703b16baac7d972cca24170ad2b680f67237145a9056a28b55fc1e08bedb' 
  AND token = 'sACOSgffrLvnEyex08aeIgO0EcGtZfHsh/6pqa8kA2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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