SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c2084199006d2dd08164485681191633b66681e0b2647b8cec9b1e96148eb4' 
  AND token = 'KhFL0RkDyqzyXtF5Eg6p9aOIucZUCNQlQ4tG+GFYRWc=' 
  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