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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e6294519288c4c6403f1720915d6134ff74842dcad45a4e0cbd66e50c2599f' 
  AND token = 'x/K0Hlbwsbt3h7pIs7JhafH3B/WC390C9jfOG0obYsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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