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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc06f7ade44f22a43418d54513cff40670915038669da758b8d88a2e7085e91' 
  AND token = '0idIBR9lCrFLHnucXUTijajhq5v4g9d3NA0N5jTs+b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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