SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdf939fc6b838421889fbf51e285fe53db8a38fbaeefb2c9d4f52a8f12d5278' 
  AND token = 'bFqeWJ5dX1Mvtz/f38pUsb8ByUTDuBiD9GYvft7aGKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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