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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c012171bea01d77186ec752e71ad8bdd7c7f36851819a11c38cb88ba78fbe7d' 
  AND token = '6z6cnuIfhgPhyjIxF7JtiGbwVv++xFZDKgLYQZh6jLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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