SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199ef9317759ffd5458337d0ce663efb5a81a4786c8416b1752f85f5922d6ea1' 
  AND token = 'EeL11MB7q6yXvjn+3u+BMRbqgWk8yFICP33P3A2Ok0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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