SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44481bd3f80d07df822b45c6fa4db43bf4bd1c2f6d758d2436846d3e36a7f974' 
  AND token = 'hLUaojPs5OLlS0N+c01eInup7GUt/jmGbQd3CAiDxd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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