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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d41fe9a489a474a502783ed344f5b195ea71bcab3663739057094b5666d986b' 
  AND token = 'Syq6CkdxJnbWzfNR37+xnyXkRccBqprFnck8aIzef9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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