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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b0c1225ea6c72567418789c28de54ffa8d62acef269e87c983121f34d315ab' 
  AND token = 'G3v8kEI7O+64iYItVA+JhFeTXdv0oiV9Wuo1l9r5mlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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