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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b543f2c4f3c67d3a0534ab5691ea278649e9d83ea36fcd9c9fed90045ed89fc' 
  AND token = 'ju0m6L9VsgM9ea4pSn6nQXxjAojT64MBBQTLpgnO3xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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