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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3863bec0780b480fc4a3b6dde55cdc7eb9a9ebde6ae13fc659dbd657de79a5' 
  AND token = 'vFighh82kywo+twuq7CsPseNJqHJ2/s4mVnmFWqB9uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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