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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1efaf9f10e1ad7cd674fdb52e69d04a4cf35a74e88ca3bb6add0ea55796c7f' 
  AND token = 'Uznk0U/M20uY7YdaBtE9e2yswdL0o3eHQVp6JmIoSXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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