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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1d47b68ba66dfeb4108b7c6f093c16344ad4d6d6ce3d0e0f88405726e41f6c' 
  AND token = '8hqAj1lXzBmEdCt7U6xkyIHfaDgIyOkJruF4d+bNlvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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