SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76577dcf25ca183cf9c7bf8c9f82f664ae026e687aa4da86e8728514bc14149d' 
  AND token = 'AmhtGGatOzuiaScYjJ8R9dmIiBXQ1wo/JnxRKgBvXeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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