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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b256aaea0de2725c7aedb0c351709285e1ecc94bc2f3857bf67de04b0a1997' 
  AND token = '8KNtuRS69WtMZ6tjESutZ4BgDB8kXxHSlGar5jB+VBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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