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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6666e98353e33c9082dac8744a4139a55f4827c56fa8e4b6f792f717f121d52f' 
  AND token = 'rxgP0LLyKxKf4K2V6/I46PDvqNtJkfgzk1unCekrQnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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