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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b6827ee5b994acf79b080ea62a64145afebd17e2a1365c26d4642ea66479b5' 
  AND token = '2hsL63q4qCZOUGh/bXdcdnMz8ZkgIeAmxDUQwiQZmI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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