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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '946af948fa387b408b2d10f392d5a87907f92df57c30e97ee48d63a7adb4529b' 
  AND token = 'QNsKlGxV9sYOkm2vQcewg0n1paflhNLaSBDlCfH7Slk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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