SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb374fd2acabe80e471d7c846875c534dca2d58aab267630dfce25b84feecae' 
  AND token = 'ZXdxEGphoITUZrZG49+BbYWD6kz/7ObhsXPASjNwQjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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