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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6885b95cbb4f07f4f66da3cfbfbe990fde689a8b006c025367f12ea9da7872a' 
  AND token = 'GNMgeLCRcj0DTTAytkQcSscMvmD+/vB2kJQrCwn6cNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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