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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938cd582c65421a80b02c26bdbe86db35ebe3d972fcabee03a4b8dd02f1a26b9' 
  AND token = 'QTJ9OMSZKXrNsyBASJBpV2viP2/PJ+O1w426+m0U/mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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