SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31bed0695a7064ee753edf1a6ef006177c1fd82b81516ef928441c84931303b4' 
  AND token = 'roEiICk9a0X49vM4HS27zu5t+W8kQWHjPmMwIt1tT00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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