SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ddf69ec2aefbfe57e522bf459ee7ea943b747a8a3e75a14ad94756a83fcfdf' 
  AND token = 'VOouYLuxJuwOhMCxbQm4OPcFiU//O26EMZUhN7GVOM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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