SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212e9d9b3a942ac876de4b7e96b294317916549f9e70b4eb793319523e478a8f' 
  AND token = 'qdo/hu2Mt1HdzBSGbUypQWQly759s7vgpxAVyRsPAEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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