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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f36e9e59842070b6d70c281ed2be64e01dd27d8bd4ba2592f4ab0290d018d7' 
  AND token = '6RV86gdL4/gbSvEEg2aPvZjIYMymxZjnG6J8tLWRcLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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