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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc50c79259c921714a9e4d8c5dca95039a352f33c89c4f7b576f8985b23254d' 
  AND token = '7EE9hd9IHKCCBChOUloqz6D+5lThQh46Ic4gvnDJAN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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