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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89cbdf8dbef7f4e5ee838ad0faa19cb167922a07882f0aa147ea21d5517e6a63' 
  AND token = 'bVXRbOa0oAygH1WprtXQ2jjPoRgTehb2WhxWT9PPuRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00493

JSON explain

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