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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c5e2928490ba71209d365dc23c5b9cfa1b5cac4440c590c291c9f74738d3ac1' 
  AND token = 'tAcTT0MVbTcEkECocSTUAB09wH1R5WYdduo019/vt6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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