SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c322b07c6c897c49d33fd957518aa5db104d57d22bb52feb765e35f7d677d4cf' 
  AND token = '7bO5qzR9SuA9ohxotPYHwp/pNM+sVf9E4g3DKGQiBIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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