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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f0edc087d838e620de2089e6a9273ab0692c60c98a479266d32dbee1685380' 
  AND token = 'dxJZe5xwA9JoC8/gtrf3eWtmodCt5Jdbrb6yHWaqP+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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