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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5219e4e6d24e76cf4f4943e99a32bbc5a18f9f35225cde57b8e636cd1c806ff' 
  AND token = 'Dbl5IFDlg4ZdGQ+rxyedIAqW0Fo7d9lOagc02HhjUzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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