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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9153d83711454028a4e4e87965d2b567140e540ff68e55148cd496e0fc19af5' 
  AND token = 'AwWv87ahYy/XogscB+0D42CMWf7zMtzhRwkc6iNLNmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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