SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4f779b24a1b36d9fae453bcb92d6ac05481812697318a3c4c95faa16d8b18f' 
  AND token = 'h3VU178hR4LjPOSDBUWYxBD1fNJAX/Vtn/XxMWlXblQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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