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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f69cd1c694db1fd1e02a21c0dbe8e7cec1427b9e150c84a84135650a822a06d' 
  AND token = '3VOxAPLGBRt3CAL++qOejTvq7aNSSQJZMK4zkI3FAkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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