SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb411d8cbbd35d48c26b0f78118013ee6e22dc373694960dc5f24129459edc73' 
  AND token = '0hZvVaBtMz9oH/OpLwBk9Z+nQIYi2OByb/g6hz49SPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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