SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af359fe19934552a92a558a39af77fe40f9c0dd35e8c015cae0f708e86e88b16' 
  AND token = '8q+PDpPaEnqideo57SKVFfmdwKBbhITMI4PXp5+f2ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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