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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14cc1ab35d48f440200201de45619b53ff49bb337eb2b122ce4380cbb6d08248' 
  AND token = '7suIS6q8aVrHkUccgbGW3Ml+Tb0vP1rkMux85LrAYus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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