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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7fd9f21c7f22ebbdbcf65780a4fb449e3ef3436c9c598d4ebde4799626518c' 
  AND token = 'MeJUoEu9szQr5Jhy0wGtYw9WTvezzz9WsAZvdONsop4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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