SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ba02da88e3c3a6e9aa390184e62e8652879bf4adff96b16aca317099c0fe39' 
  AND token = 'W4VseBed8mqAzpXeZlZhJNvctD+7mQtXyH9U2i6oNcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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