SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb016590059504bdf751dc7f7a1b297e290dda5c8b8e7b074b0e57c7e04b896a' 
  AND token = '0YzH9wA+92pnUsXYHou1LTTbyYxD+qumdrWWinRlwmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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