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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244b827e76cc8c13db5500f893a62ab80425135532ae202de5d31e4036fd2244' 
  AND token = 'yH/lbnMs6yxynPZckktgjQrx3ITTSIakzsi6XSVOmgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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