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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce1b0a4358b66f6830db670858cfb9ac7b7707f87810c9f7064bdf61b896cfa7' 
  AND token = 'MXICWSWO3zU9qaRUSrlokJo6SESfvP54cCrAGoujjO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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