SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59d2f31e923e606a46a5cabff54cda676f11480cd87f65b9ff025b07e8743c9' 
  AND token = 'SgAqxj2J2avpWw+ROJmGRe6OYS7NKWmH8pOEwWZMu9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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