SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e864df5f465b8e5c7a1c4ef14c29bee4093e8ed3425df66bbf9f88534cf9df7' 
  AND token = '9EnaYJ1YwREy1l3hgTjVIBwWH7yIxDZ+PuA/xWuf1X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}