SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af14b2dbd69ed32785801fe14d45509dc5674cebca3e8e078c4ecc5a45a02fb4' 
  AND token = 'buNjY02Y0BqBxuHaJTxVDl9W9GVSz/qER/Uwgffhyqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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