SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0912c82f6e57fd6c716c607cce9f8352a862eaf50dd4f1e6b32efdfed851129c' 
  AND token = 'ZfH1/nuI7TyQvM9CrOHcmJRVWDmxweC0ofEIhOHU0kE=' 
  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