SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c369de5bb068e7298759e216e4f9604f496671a6cb7f76141fd7a52f7c5cc8d' 
  AND token = 'sewL9NWkDY+Fb+Q/wNzEXvtmDTOzFFl1DxlePY/xAyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

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