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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58cbb4991037a40dc5551ba3d3e5338b5a1e835bd04f92060a83b8dcd07f7358' 
  AND token = '05N7JBMl2qXArb0pMOXkXkWM7h+UTXO9NusQv7ghGBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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