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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd673c0bd36faf6c7f47dc2efc52b972ebaa8b68cf0530c8b827e01f964ad8851' 
  AND token = 'UWOyB9pr+BDRmMYcTUG78gSRp8p584OlD+jJ7jbq3cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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