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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650a79f53e78dc8ce9f7c9ef4936c3190bdffb63be5f6fc05a221772b4e6c839' 
  AND token = 'VKDq56CpWYCWpA7YlyY53Cmu9ow8hufr8TzRb/icXuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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