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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b522812cf24c60a26d68ff479b8805bc410c40c055f7b554df13d5614c182d5f' 
  AND token = 'aBX7p2ydlpkXiOZlpoj7U9nRWUlcP3nE03M46MIlhWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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