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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e954f06883d752629ae53eb0f7d4b8165c1a4ef41eb4546a8ece02bf9d5e7d3' 
  AND token = '9H3CtX1cHgc8uRujBaXBp6I83xbsZP0HPXE1zoNwZZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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