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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24b9ee0a0bc5334e544bc912b04fdcc1b5ae4f0d48efea37428ee97231bb36c6' 
  AND token = 'AgumBRHLeWR9fgA4G9HdsqxBvpXn7SgmZxnUaAm1d08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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