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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01fb3f93421b51806cf332d577e8aa57e848ce6da6c71abd2929521f23140650' 
  AND token = 'LrdoiB+wunvWY1xu67iPoN4yh0XR/L9fGetfeW5nUe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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