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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f027b65e6ca611d7efdaab0d904ed57641e8bbfc6c48cddc04f696d544c9a926' 
  AND token = 'Ob3P8D9bIz3vIUaUXeFu3CeVANa3qStCtKsh7a97QQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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