SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f384e10003bf1f3cf480b725c874882babc7b8a1c89e44692ddbd2bb7fb4713' 
  AND token = '8XJDmoUxvcBOt84mdP+iO8OICmwzI8ww34Bd9I+qmJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

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