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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362dbfe4eef497346ab7e27186b7384b8696bd59e9cf060affae774e7c923eff' 
  AND token = 'QS6rUbeZyntUbiRwVSA0v4azkwAjmtHpduReyf1nfG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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