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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '124e7b37f2fd7efdfd37fd3193e446310f5cc4add538eec49ed20a4f48558072' 
  AND token = 'wUv+74fm6WkjB7ysc8SbojQP/xMVcRWpXFjCoSt4E2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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