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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbd3a633cfc66d99a56f56a6d451d92b6f4f8afbf5079958f24cc07a354c89f' 
  AND token = 'jLZQmSP+v9xjEgUe5WO0r+dpMkJslyPlgn7s0ca+7xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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