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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0d86ce8b7d82fc295d48da2291a6c95a952dbe87d25529cb2f100cfc04f2f2' 
  AND token = 'gYMo82vGMS5IDlemzAaWhvs7c8DhhtNCPhli0hUC9tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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