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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '278d18a0bf3ffc823832e466fcd20748454e92e3c49e046bb68b5c0d717d50a8' 
  AND token = '/sPJDYJyXU+7Xgk0zYKZ4laoerLnaKJCKgydfbK0T6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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