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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76aae7c6a4d91d30a8e312dfb2a59429f15e2b3f09b4c8ca92aeda3d6839aeca' 
  AND token = '5tiUfB13/Z43NawMkXv1ZmpesD5ZTsY4aGbjNvtNE4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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