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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867b7f4dfcebe9a993eb48948c54d67bd04c9ab90fba55d5fc5b9d544181d376' 
  AND token = 'AJCE0ctW/AFcmnBCgYqitWd/Vm0zEuXJkAmgoB63JsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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