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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29cdc8b0d2e8e01276c74c9f01bf69366bbcf96eaad835fca8caa7b914da3a6e' 
  AND token = '4oGiWO5tzRUMxyCwlRFP5zyfapP8VORf0mvxGTNBqLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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