SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7b191adac90b1b5172302a4b3914952a792bc234134c6798622938c006a67b' 
  AND token = '/ATXzcimis/HSGG86U5IOaTa3/J++pynu0H4HSFWIMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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