SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6580c2c9ce256e2cb98e5424f592cd6c94f92bdbe74755af5ad57063a5ae54fa' 
  AND token = 'avcryRFGnSFGh/H2Mfj5PNdYs10JwudHI+y/Oa5RUUE=' 
  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