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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa2fb7e7ea72b56a8375a9dba86a2fc2b5c4a0b5a204b8a18700d0a39c744f0' 
  AND token = '1SnuwuQX6QTznAh1IOX0vaERkhUWUbtzJid+7fKzlFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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